lilngineer
Cadet
- Joined
- Jul 19, 2007
- Messages
- 11
Hi,
I have recently purchased a 1994 Sea Rayder with a Mercury Sport Jet 90. The history is that the previous owner was running the boat on the lake one day and suddenly had a loss of power and it was brought in. The engine was found to have low compression in the bottom cylinder and needs to be rebuilt due to a damaged piston [see pic] and a crack in the cylinder block near a port.
I plan on performing the rebuild shortly, but my question is what likely caused the crack? I spoke with the tech who examined the engine and he stated that the bolts for a cover 90 degrees to the cylinders (transfer port cover?) were loose [see pic]. If this is true, what likely caused this condition? Whatever the true problem was, I would like to ensure that the problem does not return with the rebuilt engine.
Any opinions/help is greatly appreciated!
Thanks,
Jason
I have recently purchased a 1994 Sea Rayder with a Mercury Sport Jet 90. The history is that the previous owner was running the boat on the lake one day and suddenly had a loss of power and it was brought in. The engine was found to have low compression in the bottom cylinder and needs to be rebuilt due to a damaged piston [see pic] and a crack in the cylinder block near a port.
I plan on performing the rebuild shortly, but my question is what likely caused the crack? I spoke with the tech who examined the engine and he stated that the bolts for a cover 90 degrees to the cylinders (transfer port cover?) were loose [see pic]. If this is true, what likely caused this condition? Whatever the true problem was, I would like to ensure that the problem does not return with the rebuilt engine.
Any opinions/help is greatly appreciated!
Thanks,
Jason
